fix(oauth): enhance error handling and transaction management for OAuth user creation and binding

- Improve error handling in DeleteCustomOAuthProvider to log and return errors when fetching binding counts.
- Refactor user creation and OAuth binding logic to use transactions for atomic operations, ensuring data integrity.
- Add unique constraints to UserOAuthBinding model to prevent duplicate bindings.
- Enhance GitHub OAuth provider error logging for non-200 responses.
- Update AccountManagement component to provide clearer error messages on API failures.

model/user.go

@@ -429,6 +429,65 @@ func (user *User) Insert(inviterId int) error {
 	return nil
 }
 
+// InsertWithTx inserts a new user within an existing transaction.
+// This is used for OAuth registration where user creation and binding need to be atomic.
+// Post-creation tasks (sidebar config, logs, inviter rewards) are handled after the transaction commits.
+func (user *User) InsertWithTx(tx *gorm.DB, inviterId int) error {
+	var err error
+	if user.Password != "" {
+		user.Password, err = common.Password2Hash(user.Password)
+		if err != nil {
+			return err
+		}
+	}
+	user.Quota = common.QuotaForNewUser
+	user.AffCode = common.GetRandomString(4)
+
+	// 初始化用户设置
+	if user.Setting == "" {
+		defaultSetting := dto.UserSetting{}
+		user.SetSetting(defaultSetting)
+	}
+
+	result := tx.Create(user)
+	if result.Error != nil {
+		return result.Error
+	}
+
+	return nil
+}
+
+// FinalizeOAuthUserCreation performs post-transaction tasks for OAuth user creation.
+// This should be called after the transaction commits successfully.
+func (user *User) FinalizeOAuthUserCreation(inviterId int) {
+	// 用户创建成功后，根据角色初始化边栏配置
+	var createdUser User
+	if err := DB.Where("id = ?", user.Id).First(&createdUser).Error; err == nil {
+		defaultSidebarConfig := generateDefaultSidebarConfigForRole(createdUser.Role)
+		if defaultSidebarConfig != "" {
+			currentSetting := createdUser.GetSetting()
+			currentSetting.SidebarModules = defaultSidebarConfig
+			createdUser.SetSetting(currentSetting)
+			createdUser.Update(false)
+			common.SysLog(fmt.Sprintf("为新用户 %s (角色: %d) 初始化边栏配置", createdUser.Username, createdUser.Role))
+		}
+	}
+
+	if common.QuotaForNewUser > 0 {
+		RecordLog(user.Id, LogTypeSystem, fmt.Sprintf("新用户注册赠送 %s", logger.LogQuota(common.QuotaForNewUser)))
+	}
+	if inviterId != 0 {
+		if common.QuotaForInvitee > 0 {
+			_ = IncreaseUserQuota(user.Id, common.QuotaForInvitee, true)
+			RecordLog(user.Id, LogTypeSystem, fmt.Sprintf("使用邀请码赠送 %s", logger.LogQuota(common.QuotaForInvitee)))
+		}
+		if common.QuotaForInviter > 0 {
+			RecordLog(inviterId, LogTypeSystem, fmt.Sprintf("邀请用户赠送 %s", logger.LogQuota(common.QuotaForInviter)))
+			_ = inviteUser(inviterId)
+		}
+	}
+}
+
 func (user *User) Update(updatePassword bool) error {
 	var err error
 	if updatePassword {